* {

}
/* Tag Name*/
body {
    background: #ddd;
}
/* Class */
.card {
    padding: 10px;
    background: #fff;
    margin-bottom: 10px;
}
.card p {
    font-size: 14px;
}
.html {
    background: orange;
    color: white;
}
.css {
    background: blue;
    color: white;
}
/* Id*/
#header {
    background: #ddd;
    padding: 10px;
}
#header, .card {
    margin-bottom: 10px;
}